FIRM AND PRINCIPAL OWNERS MainLine Investment Advisers, LLC is a Delaware limited liability company. MainLine Investment Advisers, LLC is sometimes called the “Firm” in this brochure. The Firm was formed in August 2011 and began operations on January 1, 2012. We provide continuous and regular supervisory or management services with respect to assets totaling $246.37 million. All clients are either private funds or venture capital funds. MainLine Investment Advisers, LLC was formed by the private equity professionals of CMS Fund Advisers, LLC (“CMS”), an advisory affiliate, as a planned reorganization of CMS’s private equity business to a separate investment platform. For purposes of this Part 2 Form, an advisory affiliate or a related person of the Firm is considered to be a person or entity that controls the Firm, is controlled by the Firm or is under common control with the Firm. The Firm has one owner: MainLine Investment Partners, LLC (“MLIP”). MLIP is owned by two individuals: David A. Clapper and William A. Landman. Schedule B of ADV Part 1 reflects control position(s). MainLine Investment Advisers, LLC is member managed by MLIP. MLIP is managed by a board of managers, with Mr. Landman as its sole manager. In addition to the owners, there are four other individuals who hold executive officer positions for the Firm: William J. Romanelli, Alex Chadwick, Donna M. Rittershausen and Ryan Rojo. The Firm has no subsidiaries. The principal office and place of business for MainLine Investment Advisers, LLC and certain other related persons is 308 E. Lancaster Avenue, Wynnewood, Pennsylvania. Please see Item Number 10 for more information about financial industry activities and affiliations. The Firm’s investment policies are set by its member, MainLine Investment Partners, LLC, through the board of managers. Other executive officers participate to determine investment recommendations on an as needed basis. These professionals may be referred to in this brochure as “MLIA Investment Professionals”. Additional information is included in a brochure supplement with respect to (i) each person who formulates investment advice for a client and has direct client contact, and (ii) each person who has discretionary authority over a client’s assets even if that person has no direct client contact. A brochure supplement is attached for Mr. Landman. Others will be delivered separately if applicable and required. As described below, the Firm’s clients are private investment funds or managed accounts for institutional-type clients and other similar entities that we advise. Part 2A of Form ADV: Firm Brochure Page 5 INVESTMENT SUPERVISORY SERVICES The Firm’s main business is to provide investment advice to various private investment funds (either directly or through a sub-advisory relationship with CMS Fund Advisers, LLC) which are called our clients. Some of our clients are limited partnerships or limited liability companies that are related to us because there is some common ownership and/or control between the Firm’s

owner and the general partners or managers of those investment funds. Other clients may be related to CMS Fund Advisers, LLC, an advisory affiliate. Some of our clients may be funds of funds, meaning that they invest in other investment funds that may or may not be related to us. All of our clients are expected to be closed-end (meaning they do not accept additional subscribers after a stated offering period) investment funds with capital committed by investors that may be payable upon initial subscription, or may be drawn down and contributed over time to purchase investment securities and pay expenses. Our clients are not expected to offer redemption rights or liquidity to their investors. Please refer to a schedule of active affiliate- sponsored investment funds that are clients, included at the back of this Part 2A of Form ADV. Clients who are not affiliated investment vehicles are not listed. Our advice is considered to be investment supervisory services because we provide continuous advice based on the individual needs of each client. We look for investments that meet the stated objectives, strategy and investment guidelines of each client. We usually only recommend that a client buy a security if that type of security and the amount to be invested in that security meets the client’s objectives, strategy and investment guidelines as stated in the client’s offering memorandum and partnership agreement or joint venture or other agreement negotiated directly with an investor. We supervise the entire investment process and monitor the performance of each investment security held by our clients. We make recommendations to buy, hold and sell investment securities. However, we do not make the final investment decisions. The final investment decisions are made by the general partners or managers of the various investment funds that are our clients. As stated above, there is some common ownership and/or control between the Firm’s owner or CMS and most of those general partners or managers. We primarily provide advice with respect to stock, equity securities and debt securities in private companies and limited partnerships. We also offer advice with respect to a wide variety of securities, including (i) any type of private or public stock or equity interests, (ii) investment company securities (including variable life insurance or mutual fund shares) , (iii) warrants, (iv) corporate debt securities, (v) municipal securities, (vi) options contracts on securities, (vii) various equity and debt interests in or secured by real estate, and (viii) interests in other investment funds such as private equity, buyout, venture capital and hedge funds. We do not participate in wrap fee programs. The total amount of client assets we manage is currently $246.37 million as of 2023 year end valuations. Some of our accounts are advised by a related subadviser (where value Part 2A of Form ADV: Firm Brochure Page 6 of these assets are included as part of our RAUM calculation). This total includes one account pursuing a venture capital strategy.